660345673 has 4 divisors (see below), whose sum is σ = 711141508. Its totient is φ = 609549840.

The previous prime is 660345667. The next prime is 660345701. The reversal of 660345673 is 376543066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69272329 + 591073344 = 8323^2 + 24312^2 .

It is a cyclic number.

It is not a de Polignac number, because 660345673 - 2¹³ = 660337481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660345643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25397898 + ... + 25397923.

It is an arithmetic number, because the mean of its divisors is an integer number (177785377).

Almost surely, 2^660345673 is an apocalyptic number.

It is an amenable number.

660345673 is a deficient number, since it is larger than the sum of its proper divisors (50795835).

660345673 is a wasteful number, since it uses less digits than its factorization.

660345673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50795834.

The product of its (nonzero) digits is 272160, while the sum is 40.

The square root of 660345673 is about 25697.1919283022. The cubic root of 660345673 is about 870.8107442189.

The spelling of 660345673 in words is "six hundred sixty million, three hundred forty-five thousand, six hundred seventy-three".